Parking spot at the house, fenced on three sides??

And the neighbor put up the fence afterwards, even though your parking space (Sondereigentum) was there? Honestly? Then you really don't have to care. If in doubt, I would just park in front of it, because why should you let him interfere with your parking space due to his planning? At first, it seemed to me that this was a problem in your head, but the picture shows the facts. Neighbor's fence = neighbor's problem.

I would also just block the gate.

Unfortunately, that’s not possible because the fence runs along the entire parking lot, so getting out is not possible,

My neighbor across the street also has an A-Class, but it is just as wide backwards as it is forwards (?)

If you drive the car all the way up to the fence, you can get out. So why don’t you do that? For safety, place a [ZIegelstein] in front of the wheel, that way you can drive up to 1 cm from the fence without any problems. Daily practice in my garage. 2 Smart cars one behind the other.

Am I understanding correctly that you don’t want to park there because of the gate? And the gate belongs to the neighbor?
That doesn’t matter to you if that’s the case. There is plenty of space, right?
Yes, the gate belongs to the neighbor and he has about 10 cm to get past the car, so it’s a joke if I were to allow him to enter the property, which I would do even if I were not legally obliged to.

So the neighbor would like to go through the gate he built, over your parking space, onto his property, and that’s why you can’t (or don’t want to) park all the way to the right by the fence/gate?
If that’s the case, it’s really really really and absolutely the neighbor’s problem and not yours. Park on your space as best as you can, straight in, all the way to the right by the fence. Done. Sure, I would talk to the neighbor first and explain your "trouble," but really nothing more. A "good neighbor" will understand that and look for another solution to his! problem.

The gate is a planning error that should not concern you. I agree with that. Why is there a gate there?:eek: Of course, you cannot answer that.